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UC4b
18 pins
7805
5 Volt regulator
UR1
ZTX 313
ZTX313
1N4448
or 1N4148
or 1S44
2 Yellow bands
Some diodes may have their number printed on them instead.
Not used
CDA 6 5MC
3 lead ceramic filter
(e) Other components
L-Modulator type UM1233
^15ff 3 5mm jack sockets for power, ear and rrvic.
off 40 pin !C sockets
Either 2 off 24 pin 1C sockets
or
1 off 24 pin and 2 off 18 pin fC sockets
5 way keyboard connector
MtS2 8 way keyboard connector
^-Modulator trim (black card)
Ready made flat keyboard
Aluminium heatsink
4BA nut, bolt and washer for fixing regulator and heatsink
Printed circuit board
2 Case halves
4 Rubber feet
7 Self tapping Pozidnv screws - 3 Black (long). 4 Yellow (short)
9. POWER
SUPPLY
If you wish to use your own power supply with the ZX81 , it should conform to these s pec ifica lions
D C only - positive to the tip of the 3.5mm jack plug Need not be regulated, but should be well
smoothed
10. SERVICE
Sinclair Research Service Dept,
Chesterton Mill
French's Road
Cambridge
CB4 3NP
c Sinclair Research Limited 1901
7
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